This one could be close. Sidious is just a little stronger than Dooku and he took out three Jedi Masters with ease, then alost beat Mace, so I think Dooku could probably take out at least one of the above right away (since Sidious took out two right away) and then it's be just like it was in ROTS with Obi-Wan and Anakin but it'd be Obi-Wan and either Mundi or Fisto, and Obi'd get pwnd like he did in the film and then whoever's left'd get pwnd really bad. So I say Dooku wins. But if he doesn't get everything right at the beginning he could lose.
Dooku wins without breaking a sweat.........
Obiwan gets Force-tossed across the room and is knocked unconscious (sound familiar?)
Fisto blocks about 2 strikes and is then slashed across the chest and dies screaming like a b!tch (sound familiar?)
Mundi blocks 4 and is then struck, loses his weapon, tumbles backward, and falls on his stomach (sound familiar?)
Mace only defeated Palpatine in saber combat. Palpatine would have won with his force powers in the end. But Dooku would take down Obi-Wan in a few seconds like he did in ROTS and then Kit and Ki-Adi wouldn't stand a good chance on taking down the count. I mean if anything Obi-Wan is better then Kit and Ki-Adi-Mundi.